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Shared functions to convert between year/month/day/hour/minute/second

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and "seconds since 1970" (POSIX time_t). See sys/arch/sun3/sun3/clock.c
for an example of how these can be used.
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gwr 1997-02-19 23:29:28 +00:00
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commit d8b59a12b5
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/* $NetBSD: clock_subr.c,v 1.1 1997/02/19 23:29:28 gwr Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: clock.c 1.18 91/01/21$
*
* @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
/*
* Generic routines to convert between a POSIX date
* (seconds since 1/1/1970) and yr/mo/day/hr/min/sec
* Derived from arch/hp300/hp300/clock.c
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <dev/clock_subr.h>
/* Traditional POSIX base year */
#define POSIX_BASE_YEAR 1970
static inline int leapyear __P((int year));
#define FEBRUARY 2
#define days_in_year(a) (leapyear(a) ? 366 : 365)
#define days_in_month(a) (month_days[(a) - 1])
static const int month_days[12] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
/* Use an inline to make the logic more obvious. */
static inline int
leapyear(year)
int year;
{
int rv = 0;
if ((year % 4) == 0) {
rv = 1;
if ((year % 100) == 0) {
rv = 0;
if ((year % 400) == 0)
rv = 1;
}
}
return (rv);
}
time_t
clock_ymdhms_to_secs(dt)
struct clock_ymdhms *dt;
{
time_t secs;
int i, year, days;
year = dt->dt_year;
/*
* Compute days since start of time
* First from years, then from months.
*/
days = 0;
for (i = POSIX_BASE_YEAR; i < year; i++)
days += days_in_year(i);
if (leapyear(year) && dt->dt_mon > FEBRUARY)
days++;
/* Months */
for (i = 1; i < dt->dt_mon; i++)
days += days_in_month(i);
days += (dt->dt_day - 1);
/* Add hours, minutes, seconds. */
secs = ((days
* 24 + dt->dt_hour)
* 60 + dt->dt_min)
* 60 + dt->dt_sec;
return (secs);
}
/* This function uses a copy of month_days[] */
#undef days_in_month
#define days_in_month(a) (mthdays[(a) - 1])
void
clock_secs_to_ymdhms(secs, dt)
time_t secs;
struct clock_ymdhms *dt;
{
int mthdays[12];
int i, days;
int rsec; /* remainder seconds */
bcopy(month_days, mthdays, sizeof(mthdays));
days = secs / SECDAY;
rsec = secs % SECDAY;
/* Day of week (Note: 1/1/1970 was a Thursday) */
dt->dt_wday = (days + 4) % 7;
/* Subtract out whole years, counting them in i. */
for (i = POSIX_BASE_YEAR; days >= days_in_year(i); i++)
days -= days_in_year(i);
dt->dt_year = i;
/* Subtract out whole months, counting them in i. */
if (leapyear(i))
days_in_month(FEBRUARY) = 29;
for (i = 1; days >= days_in_month(i); i++)
days -= days_in_month(i);
dt->dt_mon = i;
/* Days are what is left over (+1) from all that. */
dt->dt_day = days + 1;
/* Hours, minutes, seconds are easy */
dt->dt_hour = rsec / 3600;
rsec = rsec % 3600;
dt->dt_min = rsec / 60;
rsec = rsec % 60;
dt->dt_sec = rsec;
}

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/* $NetBSD: clock_subr.h,v 1.1 1997/02/19 23:29:28 gwr Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
*/
struct clock_ymdhms {
u_short dt_year;
u_char dt_mon;
u_char dt_day;
u_char dt_wday; /* Day of week */
u_char dt_hour;
u_char dt_min;
u_char dt_sec;
};
time_t clock_ymdhms_to_secs __P((struct clock_ymdhms *));
void clock_secs_to_ymdhms __P((time_t, struct clock_ymdhms *));
/*
* BCD to decimal and decimal to BCD.
*/
#define FROMBCD(x) (((x) >> 4) * 10 + ((x) & 0xf))
#define TOBCD(x) (((x) / 10 * 16) + ((x) % 10))
/* Some handy constants. */
#define SECDAY 86400L
#define SECYR (SECDAY * 365)